4. In the galactose operon in E. coli, a repressor, encoded by the gal gene, binds to an operator site, O, to regulate e

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4 In The Galactose Operon In E Coli A Repressor Encoded By The Gal Gene Binds To An Operator Site O To Regulate E 1 (32.39 KiB) Viewed 16 times

4. In the galactose operon in E. coli, a repressor, encoded by the gal gene, binds to an operator site, O, to regulate expression of three structural genes, galE, galT, and galK. Expression is induced by the presence of galactose in the media. For each of the strains listed, would the cell show constitutive, inducible, or no expression of each of the structural genes? (Assume that galR-is a loss of function mutation.) Consider that the left hand side is the bacterial chromosome and the right hand side is the plasmid. a. galR galo galE+ galT+ galk+ b. galR+ galo galE+ galT* galk+ c. galR galO+ galE+ galT* galk / d. galR galo galE+ galT* galK / galR+ galo galE galT* galk+ galR+ galo gale galT* galk+